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What Creature Has the Best Sense of Smell?

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Science can measure the brain's olfactory lobe and count the smell receptor cells in there, but it still can't qualify a smell in the lab -- only the nose knows whether a scent attracts or repels, and reveals this perception by words or behavior. This makes it difficult, if not impossible, to identify an absolute best smeller.

Bear

According to the number of scent receptors, the bear has the best sense of smell of all terrestrial mammals. Black bears have been observed to travel 18 miles in a straight line to a food source, while grizzlies can find an elk carcass when it's underwater and polar bears can smell a seal through 3 feet of ice. It's not all about food, though -- male polar bears have been known to trek a hundred miles following the scent of a sexually receptive sow.

Shark

Since the great white shark (Carcharadon carcharias, a.k.a. "Jaws") reportedly has the largest olfactory bulb of all sharks, it should follow that it has the best sense of smell among sharks. However, recent research at Florida Atlantic University indicates that great whites can't smell any better than other sharks, and sharks in general can't smell any better than other fish -- but add in the shark's other senses of movement in water and electromagnetics, and it still may not be safe to go in the water.

Elephant

Some animals have an extremely selective sense of smell and surpass others in the detection of a particular odor. Elephants, both African and Asian, have a superior sense of smell when it comes to water, and particularly to underground water. They can scent water as far as 12 miles away, and they can remember where they have previously found water. A herd will use feet and tusks to dig waterholes for themselves to drink and bathe, but they're willing to share, so the exposed water benefits other animals as well.

Kiwi

Experts differ on the sensitivity of some birds' sense of smell, such as the carrion-eating condors, but New Zealand's kiwi is accepted as having an unusually keen nose for a bird. They have developed this olfactory talent because they are flightless and must find their dinner of insects and worms on the ground. The placement of the kiwi's nostrils in the tip of its bill is an unusual adaptation that makes finding food easier.

Snake

Snakes have a highly developed sense of smell, but they don't use their noses for this. Instead, they "taste the air" with their tongues, using the damp surface to catch scent particles and carry them to a special organ in the mouth called Jacobson's organ, where they can be identified as food or danger. Many other animals have a similar organ, including bears.

Moth

The champion smeller of the insect world is the male silkmoth. He can scent his ladylove as far away as 6 miles or more, and he can detect as few as one or two of her pheromone scent particles at that distance. His ardor shows itself in his walk, which becomes a stagger, as if he were drunk on love. His powerful sense of smell has inspired scientists to begin developing an artificial brain based on it that may someday become the mover of scent-detecting robots to use against drug smuggling and chemical weapons.